PROGRAMMING OF FINITE DIFFERENCE METHODS IN …
using idxmat(:,j)which is equivalent to sub2ind([m n], 1:m, j*ones(1,m))but much easier and intuitive. The price to pay is the extra memory for the full matrix idxmat which can be minimized using uint32. For the ndgrid system, to get a geometrically consistent index matrix, we can use the following command.
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